The bug was that if the actual number of backups was less than the maximum to keep, it always deleted the oldest. I didn't retry starting from zero backup before I fixed it. It probably would have created two and then started removing them. I had mine set to 11, and had different number of backups for each device. But, I also had a lot more than eleven files in the directory.
Keep a watch for a few days and see what happens. I'm pretty sure it will be OK. But, my testing was partly faking it by renaming files to give me one per day for a enough days.
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